3. Rob and Trevon are selling pies for a school fundraiser. Customers can buy blueberry pies and lemon meringue pies. Rob sold 5 blueberry pies and 10 lemon meringue pies
for a total of $205. Trevon sold 3 blueberry pies and 4 lemon meringue pies for a
total of $93. Find the cost of one blueberry pie and one lemon meringue pie.

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)